Why attribution matters
Lead source attribution tells you which marketing channels generate your most profitable customers not just which generate the most leads. Without attribution, you cannot answer the most important marketing question: "Where should we spend our next marketing rupee?" You are allocating budget based on gut feeling instead of data.
The simple attribution system
The simplest attribution system has three components:
Component 1: Capture the source at the point of lead creation.
For digital leads: UTM parameters in your ad URLs capture source, medium, and campaign automatically. When the lead submits a form, the UTM data passes to the CRM as contact properties.
For offline leads (phone calls, walk-ins, referrals): a dropdown field in the CRM contact creation form "How did you hear about us?" captures the source manually.
Component 2: Track the source through to closed deal.
Component 3: Report on revenue by source monthly.
Setting up UTM parameters (the technical part)
UTM parameters are tags added to your ad URLs that identify the source:
https://www.perceptra.in/services/crm-automation?utm_source=google&utm_medium=cpc&utm_campaign=crm-setup-mumbai
This tells you: the lead came from Google (source), via a paid click (medium), from the "crm-setup-mumbai" campaign.
Add UTM parameters to every paid link: Google Ads, Facebook Ads, Instagram bio links, email campaign links, LinkedIn posts. Use Google's Campaign URL Builder (a free tool) to generate UTM-tagged URLs correctly.
Your form tool or CRM captures UTM parameters as hidden fields on the contact record. When the lead becomes a customer, you know exactly which campaign generated that revenue.
The monthly attribution report
| Source | Leads | Qualified leads | Deals closed | Revenue | CPL | CAC |
|---|---|---|---|---|---|---|
| Google Ads | 45 | 15 | 3 | ?4.5L | ?556 | ?8,333 |
| 30 | 5 | 1 | ?1.0L | ?333 | ?10,000 | |
| Referrals | 8 | 6 | 3 | ?4.0L | ?0 | ?0 |
| SEO (organic) | 20 | 8 | 2 | ?2.5L | ?200 | ?2,000 |
This table tells you: referrals and SEO have the best unit economics. Google Ads generates reliable volume at acceptable CAC. Instagram generates leads but converts poorly investigate or reallocate.
Frequently asked questions
UTM parameters track down to the campaign level. If you need ad-level tracking, use Google Ads auto-tagging (GCLID) which tracks the specific ad, keyword, and match type that generated each click.
No. Even 70 80% accurate attribution (some leads do not have source data due to direct traffic or phone calls) is dramatically better than no attribution. Decisions based on imperfect data beat decisions based on no data.
For most Mumbai SMBs: first-touch attribution (credit the source that originally brought the lead) is the simplest and most useful model. It answers "where do our customers come from?" the most actionable question for budget allocation.